Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais corridas têm entradas n/a Points, 0 Wins e 6ª Posição?
 ###Tabelas: CREATE TABLE career_summary (career_summary_id AUTO_INCREMENT PRIMARY KEY, Season INT, Series VARCHAR, Team VARCHAR, Races VARCHAR, Wins VARCHAR, Poles VARCHAR, F/Laps VARCHAR, Podiums VARCHAR, Points VARCHAR, Position VARCHAR) CREATE TABLE grand_slam_timeline (grand_slam_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 2003 VARCHAR, 2004 VARCHAR, 2005 VARCHAR, 2006 VARCHAR, 2007 VARCHAR, 2008 VARCHAR, 2009 VARCHAR, 2010 VARCHAR, 2011 VARCHAR, 2012 VARCHAR, Win % VARCHAR) CREATE TABLE schedule (schedule_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Location VARCHAR, Opponent VARCHAR, Irish Points INT, Opp. Points INT, Record VARCHAR) CREATE TABLE list_of_contestants (list_of_contestants_id AUTO_INCREMENT PRIMARY KEY, Celebrity VARCHAR, Known for VARCHAR, Age INT, Professional VARCHAR, Series INT, Place VARCHAR, Dances INT, Highest score INT, Lowest score INT, Aggregate INT, Average VARCHAR) CREATE TABLE doubles_11_3–8 (doubles_11_3–8_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score VARCHAR)  
SELECT Races FROM career_summary WHERE Points = n/a AND Wins = 0 AND Position = 6th